INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Changmei Lin,Honghui Zhao,Hai Huang,Xiaojuan Ma,Shilin Cao
Recently, cellulose paper based triboelectric nanogenerators (CPTENGs) has gained widely attention due to the development of wearable, green and miniaturized electronic products. Modification of cellulose fibers or paper is a feasible method to improve the output performance of CPTENGs, however, the simple and effective routes to improve the triboelectric property of cellulose paper still remain a challenge. Herein, we report a simple method to prepare PEO/cellulose composite paper (PEO/CCP) via mixing polyethylene oxide (PEO) with cationic cellulose fibers. Benefiting from amino groups and PEO, the composite paper exhibits higher triboelectric positive property and triboelectric charge density, thereby endowing PEO/CCP based TENG with outstanding output performance. The voltage, current and power density peak values of PEO/CCP based TENG exhibited linear relationship with amino groups content; in this instance, the performance of the TENGs can be readily adjusted by the amino groups. The voltage, current and power density of PEO/CCP based TENG can be up to 222.1 V, 4.3 μA, and 217.3 mW•m −2 , respectively. Moreover, a human-health detection device based on this TENG can monitor the physiological signals such as eye muscles, respiration, heart beat and wrist pulse, promising potentials for applications in human health-care.
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JOURNAL OF POLYMER SCIENCE
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2022
·Vol. 61
·期 7
·561-570
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IF 3.046
Chuanwei Lu,Xinyu Wang,Wenhui Hua,Shan Wang,Shaojun Wang,Jifu Wang,Qiang Yong,Fuxiang Chu
Flexible epoxy thermosets have promising applications in modern industry. However, the development of next-generation flexible epoxy thermosets with high biomass content and multi-functions remains challenging. In this work, a sustainable cellulose/plant oil based flexible epoxy thermoset with excellent mechanical property, reprocessing performance, and UV absorption property was prepared. First, the amino cellulose is synthesized and used as a reinforcement and curing agent, and then the flexible epoxy thermoset is prepared by curing reaction of amino cellulose, citric acid, and flexible epoxy resin using zinc acetylacetonate as the transesterification catalyst. The epoxy thermosets show excellent thermal stability, the temperature at maximum weight loss reached 425°C. Mechanical property tests indicate that these thermosets have high mechanical strength (19.6 MPa) and satisfactory stretchability (36.1%–118%). The dynamic transesterification ester groups endow the epoxy thermoset with reprocessing ability. In addition, these epoxy thermosets show outstanding and stable UV absorption properties even after long-time UV-light irradiation or heating treatment, which makes these flexible epoxy thermosets have promising applications in UV-blocking coating. Graphical
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Jingwen Wang,Xiaoshuai Han,Weijie Wu,Xiaoyi Wang,Linhu Ding,Yuli Wang,Shanshan Li,Jiapeng Hu,Weisen Yang,Chunmei Zhang,Shaohua Jiang
Wooden building materials have advantages in terms of biodegradability , non-toxicity, pollution-free and recycling. Currently, applications of natural wood are extremely limited because of low density, low strength and toughness. Therefore, we reported an effective modification strategy with nano-scale cellulose nanofibrils design to prepare a synergistically enhanced cellulosic material . Via three steps: i) the secondary alcohol hydroxyl groups in C 2 , C 3 position were cut; ii) oxidize the hydroxyl group at C 2 , C 3 position to achieve dialdehyde cellulose; and iii) oxidized again to obtain dicarboxylic cellulose. Subsequently, thanks to the regulation of the average moisture content, the moisture content in the wood surface and subsurface increased in a short time. The wood softening layer contributes to the hotpressing treatment of the wood. The mechanical properties and dimensionality have been greatly improved. The obtained delignified oxidated hot-pressed wood with 0.55 mmol/g carboxyl group content demonstrates excellent strength of 328.8 ± 7.43 MPa and Young's modulus of 8.1 ± 0.14 GPa, which is twice than that of natural wood. Delignified oxidated hot-pressed wood also shows exceptional toughness of 8.3 ± 0.28 MJ/m 3 . Other than that, the shore hardness indicates 0.55 mmol/g carboxylic group, which could increase the hardness at the wood surface hardness to 72.5 ± 4.29°.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Cuiping Zhu,Wei Wang,Zijie Wu,Xiaochun Zhang,Zhuangzhuang Chu,Zhuohong Yang
Various methods have been used to cope with heavy metal ion contamination in wastewater, which caused serious hazards to ecological and human health. Adsorption is one of the most frequent, economical and effective methods for removing these contaminants. Herein, a porous and amino-rich cellulose-based composite adsorbent (PEI-PCS) with anisotropic property was successfully prepared by covalently cross-linking polyethyleneimine on delignified corn straw. Combined with the porosity of straw substrate and the chelating ability of amino group to metal ions, the as-prepared PEI-PCS exhibited universality (various metal ions), rapid adsorption behavior (within 180 min achieve adsorption equilibrium), high adsorption capacity (85.47 mg g −1 for Cu(II)), and good durability (70 % of adsorption efficiency after 5 cycles). In addition, the adsorption process was conformed to pseudo-second-order dynamics and the Langmuir isotherm models. Lastly, the adsorption mechanism was also elucidated. This study provides a sustainable pathway for the manufacture of efficient biomass-based adsorbents and confirms that functionalized corn straw is a promising material for the treatment of heavy metal ions.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
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IF 8.2
Xiao Xiao,Yuxuan Ren,Kaili Wang,Zhe Ling
Nowadays, organic pollutants have been major concerns in many fields. Production of functional materials based on renewable and sustainable resources for organic pollutants detection and removal was of much interest. Herein, multi-functional nanocomposite films based on cellulose nanocrystals (CNCs) with high optical haze, organic pollutant detection and emulsion separation capabilities, have been successfully fabricated based on hydrophobically-modified CNCs suspensions by 2-dodecen-1-succinic anhydride (DDSA) followed by radical polymerization with tridecafluorooctyl (TFMA). The suspensions displayed satisfying oil-in-water emulsion stabilization capabilities and the vacuum-dried films showed birefringence , high transparency, and optical haze (~85 %), due to the ordered arrangements of cellulose nanocrystals. The organic pollutant can be detected through the iridescent colors disappearing by Polarizing Optical Microscope observation. In addition of improved mechanical strength for application (27 MPa) and high contact angle of 131.6°, the hydrophobic films performed as high separation efficiency as >90 % of emulsion, due to the successfully grafting of hydrophobic molecules on the surface of CNCs. Thus, the surface modification for CNCs provide a facile approach of emulsification, pollutants detection and separation properties, which would widen the application potentials of renewable cellulosic resources in fields of environmental protection, engineering control and petroleum industry.
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CARBOHYDRATE POLYMERS
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2023
·
IF 11.2
Meng Zhang,Yaxuan Wang,Kun Liu,Yang Liu,Ting Xu,Haishun Du,Chuanling Si
Hydrogels with prominent flexibility, versatility, and high sensitivity play an important role in the design and fabrication of wearable sensors. In particular, these flexible conductive hydrogels exhibit elastic modulus that is highly compatible with human skin, demonstrating the great potential for flexible sensing. However, the preparation of high-performance hydrogel-based sensors that can restrain extreme cold conditions is still challenging. Herein, a novel anti-freezing composite hydrogel with superior conductivity based on polyacrylamide (PAM), LiCl , and PEDOT:PSS coated cellulose nanofibrils (PAM/PEDOT:PSS/CNF) is constructed. The addition of CNF increased the hydrogen bonding sites of the molecular chains in the micro, thus improving the mechanical strength and the conductivity of the hydrogel in the macro. The hydrogels achieve a high tensile strength of 0.19 MPa, compressive strength of 0.92 MPa, and dissipation energy of 41.9 kJ/m 3 . Otherwise, LiCl increases the interactions between the colloidal phase and water molecules, endowing the hydrogels with excellent freezing tolerance. Specifically, the optimized hydrogel of 45 % LiCl exhibited stable mechanical properties at −40 °C. Finally, the composite hydrogel was used to assemble flexible sensors with high sensitivity of 10.3 MPa −1 , which can detect a wide range of human movements and physiological activities.
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Materials Today Sustainability
·
2022
·
IF 7.244
J. Huang,L. Hua,L. Song,J. Li,S. E,Z. Lu
With the miniaturization and densification of electronic devices, thermal management materials have attracted scientists' attention due to the devices’ high heat dissipation. In this study, hydroxyethyl cellulose (HEC) and boron nitride nanosheets (BNNS) films (HB) coated with silver nanowires (AgNWs) were prepared using ball milling and solution-casting approach to achieve one side conduction and the other side insulation and heat conduction . HB/AgNWs1.0 film with conductivity (79.1 S/m), tensile strength (36.4 MPa), and thermal conductivity (0.244 W/m/K) were employed as bending sensors. The resistance of the HB/AgNWs1.0 film becomes larger with greater curvature due to the greater distance between one-dimensional rod-like AgNWs in the conductive network. Due to the good combination performance of AgNWs and HB composite film , the sensor can work normally for 1,000 times. Meanwhile, boron nitride nanosheets in the hydroxyethyl cellulose matrix can quickly remove the heat generated by the AgNW layer, which has a good prospect in the field of electronic packaging.
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INDUSTRIAL CROPS AND PRODUCTS
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2022
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IF 6.449
Xiang Zhou,Mengyun Wu,Lu Fu,Meng Liao,Liumi Deng,Luoxin Wang,Hua Wang,Yugui Xiang,Shaohua Chen
Traditional cellulose wrapping paper existing many problems, such as poor barrier, easy water absorption, etc. Herein, cellulose, polylactic acid non-woven fabric and antibacterial short fiber as raw materials, via wet papermaking process, prepared a biodegradable and antibacterial composite paper (SP/CFPLA-6%). Compared with the traditional cellulose paper, the water vapor transmittance of SP/CFPLA-6% decreased by 84.2%, showing obvious hydrophobicity. The tensile strength of SP/CFPLA-6% can reach 95.8 MPa, which is more than 70 MPa higher than that of ordinary cellulose paper, displaying promising antibacterial activity against Escherichia coli and Staphylococcus aureus . Meanwhile, SP/CFPLA-6% shows excellent biodegradability in biodegradation experiments. SP/CFPLA-6% offsets the shortcomings of ordinary cellulose wrapping paper and can be used as a substitute for traditional non-degradable plastic packaging materials.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
·
IF 8.025
Chang Li,Benzhi Ju,Shufen Zhang
Cellulose-based vitrimers were prepared using a crosslinkable macromolecular plasticizer and acetylated carboxymethyl cellulose via twin-screw extrusion. The cellulose-based material was toughened by the entanglement between the macromolecular plasticizer segments, and the exudation of the plasticizer was avoided by crosslinking. The prepared materials exhibited excellent hydrophobicity and shape memory properties. The plasticizer was evidently effective, and the reprocessing was completed at 130 °C within 15 min. The materials could be reprocessed at a lower temperature over a short period of time without any obvious degradation. After reprocessing three times, the material performance did not decrease significantly, thus showing good potential for regeneration and recycling.
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CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Die Dong,Rimei Chen,Jihong Jia,Chao Zhao,Zhiping Chen,Qin Lu,Yupei Sun,Weiyi Huang,Chunfang Wang,Yao Li,Hui He
The rapid loss of drugs and the weak curative effects due to cyclical urination are the main reasons why wound heal with difficulty after bladder tumour resection. Here, a bioinspired cellulose nanofibre (CNF)-based magnetic 3D nanonetwork wound dressing with excellent tissue adhesion and biocompatibility is designed by the assembly of pH- and near infrared-responsive CNF nanoskeletons, magnetic switching Fe 3 O 4 nanoparticles , and temperature switching Pluronic®F-127. The dressing with high loading capacity for mitomycin and indocyanine green can form a sticky 3D nanonetwork at the wound site and remain for a long time to release drugs through an external magnetic field. Interestingly, the dressing possessed excellent antibacterial activity , bacterial biofilm elimination, T24 tumour cell killing, and wound healing promotion through photothermal, photodynamic , and chemotherapy. Therefore, it has promising application for bladder postoperative infected wound healing to avoid rapid loss of drugs due to cyclical urination.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Peishan Li,Hui Ma,Sijia Qian,Yi Chen,Bo Lai,Shengyan Pu
Ferric sulfide is an appealing activator in persulfate (PS) activation process for degrading pollutants from aqueous environment, but the drawback of easy-agglomeration lead to a low utilization efficiency. In this study, we modified nFeS with sodium carboxymethyl cellulose (CMC) to improve its stability, and the performance for PS activation and p -nitrophenol (PNP) degradation is tested. After modification, the size further decreased from 23.8 to 18.4 nm, but with higher stability and catalytic reactivity. The CMC and nFeS is bonded by bidentate bridging of Fe-O bond. The degradation performance increased ∼7 times. The PS activation with CMC-nFeS activator shows higher reaction rate constant (0.093 min -1 ) with ∼90% of PNP removed compared to the pure nFeS with ∼80% of PNP removal at a low rate (0.014 min -1 ) with the same condition of 0.6 g/L activator, 8 mM PS, room temperature and initial pH in 90 min. Acidic condition and high temperature were more favorable for releasing Fe(II) to activate PS and produce active radicals. SO 4 - ·and HO·radicals played critical roles to attack on PNP. Detailed XPS analysis of the activator before and after reaction described the removal pathway as heterogeneous and homogeneous systems. Density Functional Theory (DFT) simulation results confirmed that CMC addition effectively decreased the interaction energy and improved adsorption ability of PS onto the activator surface.
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ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Tariq Aziz,Arshad Farid,Fazal Haq,Mehwish Kiran,Naveed Ullah,Shah Faisal,Amjad Ali,Farman Ullah Khan,Siming You,Awais Bokhari,Muhammad Mubashir,Lai Fatt Chuah,Pau Loke Show
Epoxy resins are important thermosetting polymers. They are widely used in many applications i.e., adhesives, plastics, coatings and sealers . Epoxy molding compounds have attained dominance among common materials due to their excellent mechanical properties. The sol-gel simple method was applied to distinguish the impact on the colloidal time. The properties were obtained with silica-based fillers to enable their mechanical and thermal improvement. The work which we have done here on epoxy-based nanocomposites was successfully modified. The purpose of this research was to look into the effects of cellulose nanocrystals (CNCs) on various properties and applications. CNCs have recently attracted a lot of interest in a variety of industries due to their high aspect ratio , and low density which makes them perfect candidates. Adding different amounts of silica-based nanocomposites to the epoxy system. Analyzed with different techniques such as Fourier-transformed infrared spectroscope (FTIR), thermogravimetric analysis (TGA) and scanning electronic microscopic (SEM) to investigate the morphological properties of modified composites. The various %-age of silica composite was prepared in the epoxy system. The 20% of silica was shown greater enhancement and improvement. They show a better result than D-400 epoxy. Increasing the silica, the transparency of the films decreased, because clustering appears. This shows that the broad use of CNCs in environmental engineering applications is possible, particularly for surface modification, which was evaluated for qualities such as absorption and chemical resistant behavior.
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